vidaXL Patch v3.1.4

FIX The synchronization stops when an error occurrs while processing the feed
FIX Removing manually a category from the shop does not update correctly the categories from the feed list
FIX Error received when the product is not in the shop anymore: Exception "Call to a member function get_meta() on bool
FIX The order item meta product sku is being displayed on order and invoice
FIX The track&trace is not displayed in the customer email
TWEAK Improve the check for existing category while a category is checked/unchecked from the feed list